Hi, we have 3cx on a public ip, we tested sip TLS from the internet and it is working fine. problem is when we move 3cx behind the ruter and put it on the private IP, we cannot register our 3cx softphone from outside (Internet). internal everthing is ok, so certificate is good... In the firewall we allow 5061 and forward that port to internal ip on our 3cx internal ip on our 3cx, we can see that packet are hits our rule on the firewall and that traffic is coming to our 3cx. In server activity log there is a log: Got TLS read ret=0 error=6 error:00000006:lib(0):func(0):EVP lib Please help, thanks.